From d97994b27f1cf2a2eebb87bcfce4a83330e8cf06 Mon Sep 17 00:00:00 2001
From: Alex Rickabaugh <alx+alxhub@alxandria.net>
Date: Fri, 9 Nov 2018 20:31:05 +0100
Subject: [PATCH] fix(ivy): clone ts.SourceFile in ivy_switch when triggered
 (#27032)

Make a copy of the ts.SourceFile before modifying it in the ivy_switch
transform. It's suspected that the Bazel tsc_wrapped host's SourceFile
cache has issues when the ts.SourceFiles are mutated.

PR Close #27032
---
 packages/compiler-cli/src/ngtsc/switch/src/switch.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/compiler-cli/src/ngtsc/switch/src/switch.ts b/packages/compiler-cli/src/ngtsc/switch/src/switch.ts
index 8c1dfe3e81..5b8c1507d3 100644
--- a/packages/compiler-cli/src/ngtsc/switch/src/switch.ts
+++ b/packages/compiler-cli/src/ngtsc/switch/src/switch.ts
@@ -42,6 +42,7 @@ function flipIvySwitchInFile(sf: ts.SourceFile): ts.SourceFile {
 
   // Only update the statements in the SourceFile if any have changed.
   if (newStatements !== undefined) {
+    sf = ts.getMutableClone(sf);
     sf.statements = ts.createNodeArray(newStatements);
   }
   return sf;